/Engine/Source/Runtime/Engine/Classes/Engine/GameViewportClient.h
Removes a previously-added widget from the Slate viewport, in the player's section.
virtual void RemoveViewportWidgetForPlayer ( [ULocalPlayer](API\Runtime\Engine\Engine\ULocalPlayer) * Player, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > ViewportContent )